Winch



RpS. BOLGER.

WINCH.

APPLICATION FILED MAR.24, 1921.

Patented Aug. 8, 1922.

A TTORA/ E 75 BQBEBIT S. BOLGER, 0F NEYV YORK, N. Y., ASSIG'NOR T0 INTERNATIONAL MOTOR COMPANY, OF NEW YORK, N. Y1,

A CORPORATION OF DELAWARE.

WINCH.

Specification of Letters Iatent.

Patented Aug. 8, lit-B22.

Original application filed August 14, 1820, Serial No. 403,443. Divided and this application filed March .borough of Manhattan of the city of New York, in the State of New York, have invented certain now and useful Improvements in ll inches, of which the following is a specification, reference being had to the accompanying drawing, forming a part hereof.

This case is a division of applicants copending application $61. No. dOSflB, filed august l lth, 1920. The invention relates to winches operating through the power derived from the prime mover of a seltpropelled vehicle and has for its object to improve the construction thereof in certain respects. leretottore, it has been the practise to hold winch drums against movement by means of pawls or the like which, when once engaged with the drum are releasable only with the greatest diiliculty since the direct thrust of the drum has'been impressed on such holding elements. In accordance with the present invention, holding devices for the drum are provided, which are out such a character as to permit them to be disengaged from the drum when the latter is under load and without requiring the stresses impressed upon the holding devices to be relieved.

The improvements are shown in the accompanying drawing as applied to a winch of simple construction, although it will be evident the description proceeds that such improve rents are equally applicable to winches of other constructionsv In the drawing- Figure 1. is'a view in end elevation Oi a winch construction embodying the improvements, parts being broken away in the interest ot cloarnes s. I

Figu re .Zis a detailed view in section of the driving worm torthe winch illustrated.

Figure 3 is a view. somewhat conventional, showing a modified form of holding pawl.

The winch drum (4 is supported loosely on a drive shaft Z) which is journaled in standards c which are supported on a rectangular frame (Z, the latter being mounted on the chassis in any suitable manner. The invention is not to be limited to the particular character of the winch or its drive, the preferred means for driving the shaft being shown as a won. 6 meshing with a worm gear (not shown) under shaft 2'), the worm being rotated from Serial No. 455,351.

a sprocket c to which power is delivered from the prime mover in any suitable manner. The drum a has formed thereon at one end, or carries, ratchet teeth 7. The drum can be held against rotation by means of a suitable brake band co-operating with a brake drum, formed therewith.

When the hoisting drum is under load it is the usual practise to hold it in desired position by means of some holding element such as a pawl h engaged with the ratchet teeth f. This affords a oositive stop for the drum'and relieves the brake g oi the strains incidental to arresting the movement of the drum. However, it has been the usual practise to construct the holding element 72. in such form and mount it in such relation to the drum to as to make it practically impossible for the operator to disengage the holding element from the drum when the latter is under load. In accordance with the present invention, the holding element 71. is made in such form as to permit it to be disengaged from the drum readily so that the latter may immediately be released without first making it necessary to give it a hitch forward. In the embodiment shown in Figure 1 the pawl it has a pivoted nose 1 which is normally held in prolongation oi the body ll. of the pawl by means ot a spring such as 71.2. The pawl 71, may be formed as a bell crank lever pivoted at 2', and with one arm h engaged through a pin It and the slot j with a link 7" which is pivoted at 70 to an operating bell crank Zpivoted as to Z. The supporting shaft for the pawl it may be connected opcratively to a spring such as h? for the purpose of holding thepawl 71,. normally in engagement with the ratchet teeth 7.

ln operating the link l' it will be evident that the bell crank 71 It will be rocked in a counter-clockwise direction breaking the broken (as indicated in dotted lines) thereby releasing the drum. As soon as the nose It is disengaged entirely from the ratchet teeth V actor of the load.

The improved winch is mounted on a f the spring 72, will snap it back into prolongation with the pawl body it. The pawl will then function like the usual one-piece pawl. The connection of the pin h to the link is throughvtheslot :j permits :the :pawl it to rock freely as it trips over the teeth f during rotation of the drum 0: in hoisting. r

In the modified embodiment shown in Figure 3, provision is made for enabling the operator to release the holding pawl rl.

Suitable ratchet teeth F are indicated on.-

the drum-A and these ratchet teeth, may be inclined slightly, as may 'also the end ll of the pawl. The pawl is pivoted at l and has connected to it at the point l-l -a toggle arm 11 pivoted at H to a-second togglearm H To the pivot H may :be secured a full link J which in turn is vpivoted to an operating bell crank lever K.

When the pawl H is engaged in holding relation with a tooth F of the drum Athe pivot point H is beyond the line of thrust extending along the pawl fromv the end H to the pivot pin 1. The pawl, by :reason of its inclinedend H and the inclined face of eachtooth F has acting thereonacomponent of force set up by the drum and tending to swing the pawl l-Iout of engagement with the tooth-F. This action is resisted by the positive toggle lock made up .of "the levers Hill? As shown in Figure 3 when the pawlH is loc'ked,the pivot, point ll of the toggle is thrust beyond the line of centers extending from the pivot pin H to the supporting pivotv pin H for t e arm With this relation of parts the pawl H is locked against release. However, the operator by rocking the bell crank lever K can pull the link J so as to break the toggle H H whereupon the component :of force set up on the inclined end '11 of the pawl by the loaded drum wil-l force the pawl" in a counter-clockwise direction to the position indicated in dotted lines. This improved construction enables the operator to release the drum readily no matter what the charchassis frame'in such manner as to eliminate wear and binding during distortion or mamas weaving of the frame. The frame at on which the winch and its associated parts are mounted is generally rectangular in form and extends across the side frame member ofthe vehicle chassis. "This rectangular frame (5 is supported on the chassis at three points, two of the points indicated at n and n being shown. The support it is near, the .center of the side of the rectangular frame d and consists of a trunnion pin 0 which passes through one member of the frame 0? and through'a transverse angle bar which extends between the frame members m, m, and is secured thereto.

The point of support vn maybe formed as brackets 11 bolted "to the side of one of the frame members m, at approximately their ends, and carrying a trunnion pm 0 which at the end of the other side frame member, and corresponds tothe point it. From this description, it will be seen that the three points of support are arranged'in somewhat triangular relation and maintain the supporting frame (Z for the winch out of directengagement with the vehicle chassis m and yet afford a stable foundation for it.

Distortion or weavin of. the frame members 11am will be compensated for automaticallyzthrough the three point suspension.

and the winch and its associated vparts will be free from'in urious or 'bindingstresses which might injure it or lessen its elliciency.

As pointed out .hereinbefore theimprove ments described are susceptible of association with winches ofuother typesthan that illustrated herein although all of the said This specificationsigned this 22nd day of March A. D. 1921. V t

' ROBERT s. BOLGER.

extends through the frame d. The third point of support, not illustrated, is mounted 

